:root {
  --ink: #17243b;
  --muted: #667085;
  --cream: #fff9ec;
  --paper: #ffffff;
  --blue: #47c6d9;
  --blue-dark: #167d98;
  --coral: #ff6b5e;
  --yellow: #ffd65a;
  --line: #e8e2d7;
  --shadow: 0 18px 44px rgba(36, 54, 85, 0.12);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--cream);
  font-family: Inter, ui-rounded, "Trebuchet MS", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

button, input, select { font: inherit; }

a { color: inherit; }

.shell {
  width: min(1160px, calc(100% - 40px));
  margin-inline: auto;
}

.hero {
  position: relative;
  min-height: 540px;
  overflow: hidden;
  color: white;
  background:
    radial-gradient(circle at 80% 15%, rgba(255, 214, 90, 0.96) 0 70px, transparent 72px),
    linear-gradient(130deg, #17243b 0%, #203b68 58%, #176f89 100%);
}

.hero::after {
  position: absolute;
  right: -5vw;
  bottom: -180px;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: var(--coral);
  content: "";
  opacity: 0.92;
}

.hero__content {
  position: relative;
  z-index: 2;
  padding-block: 86px 74px;
}

.eyebrow {
  margin: 0 0 15px;
  color: var(--yellow);
  font-size: 0.77rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow--dark { color: var(--blue-dark); }

h1, h2, h3 { line-height: 1.08; }

h1 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(3.2rem, 8vw, 6.8rem);
  letter-spacing: -0.06em;
}

h1 span { color: var(--yellow); }

.hero__lead {
  max-width: 600px;
  margin: 28px 0 34px;
  color: #dce8f7;
  font-size: clamp(1.05rem, 2vw, 1.28rem);
}

.hero__jump {
  display: inline-flex;
  gap: 14px;
  align-items: center;
  padding: 13px 19px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 999px;
  text-decoration: none;
  transition: background 160ms ease, transform 160ms ease;
}

.hero__jump:hover { background: rgba(255, 255, 255, 0.12); transform: translateY(-2px); }

.hero__orbit {
  position: absolute;
  z-index: 1;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
}

.hero__orbit--one { right: 4%; top: 44px; width: 320px; height: 150px; transform: rotate(-17deg); }
.hero__orbit--two { right: 8%; top: 90px; width: 220px; height: 360px; transform: rotate(35deg); }

.catalog { padding-block: 0 90px; }

.filters {
  position: relative;
  z-index: 3;
  margin-top: -42px;
  padding: 30px;
  border: 1px solid rgba(23, 36, 59, 0.08);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.97);
  box-shadow: var(--shadow);
}

.filters__heading, .catalog__status, .footer__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.filters h2 { margin: 0; font-size: clamp(1.65rem, 4vw, 2.35rem); letter-spacing: -0.035em; }

.clear-button {
  padding: 9px 14px;
  border: 0;
  border-radius: 999px;
  color: var(--blue-dark);
  background: #e9f8fa;
  cursor: pointer;
}

.clear-button:hover { background: #d5f1f5; }

.search-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: stretch;
  gap: 12px;
  margin-top: 26px;
}

.search-field {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  min-width: 0;
  border: 2px solid var(--ink);
  border-radius: 17px;
  background: white;
}

.search-field:focus-within { outline: 4px solid rgba(71, 198, 217, 0.25); }

.search-field__icon { padding-left: 18px; font-size: 1.7rem; transform: rotate(-18deg); }

.search-field input {
  width: 100%;
  padding: 16px 18px 16px 12px;
  border: 0;
  outline: 0;
  color: var(--ink);
  background: transparent;
}

.search-button {
  min-width: 112px;
  padding: 0 22px;
  border: 0;
  border-radius: 15px;
  color: white;
  background: var(--blue-dark);
  font-weight: 800;
  cursor: pointer;
  transition: background 160ms ease, transform 160ms ease;
}

.search-button:hover { background: #11677e; transform: translateY(-1px); }
.search-button:focus-visible { outline: 4px solid rgba(71, 198, 217, 0.45); outline-offset: 3px; }

.search-options {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  margin: 12px 2px 0;
}

.semantic-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
}

.semantic-toggle input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.semantic-toggle__switch {
  position: relative;
  width: 42px;
  height: 24px;
  border-radius: 999px;
  background: #aab3c0;
  transition: background 160ms ease;
}

.semantic-toggle__switch::after {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: white;
  content: "";
  transition: transform 160ms ease;
}

.semantic-toggle input:checked + .semantic-toggle__switch { background: var(--blue-dark); }
.semantic-toggle input:checked + .semantic-toggle__switch::after { transform: translateX(18px); }
.semantic-toggle input:focus-visible + .semantic-toggle__switch { outline: 3px solid rgba(71, 198, 217, 0.45); outline-offset: 3px; }

.search-options__note {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.filter-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 16px;
}

.filter-grid label > span {
  display: block;
  margin: 0 0 7px 4px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

select {
  width: 100%;
  padding: 13px 42px 13px 14px;
  border: 1px solid var(--line);
  border-radius: 13px;
  color: var(--ink);
  background: white;
}

select:focus-visible, button:focus-visible, a:focus-visible, input:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 3px;
}

.catalog__status { margin: 38px 4px 22px; }
.catalog__status p { margin: 0; }
#result-count { font-size: 1.1rem; font-weight: 800; }
.catalog__hint { color: var(--muted); font-size: 0.9rem; }

.episode-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.episode-card {
  display: flex;
  min-width: 0;
  overflow: hidden;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--paper);
  box-shadow: 0 7px 20px rgba(36, 54, 85, 0.07);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.episode-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }

.episode-card__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #dbe8ec;
}

.episode-card__body { display: flex; flex: 1; flex-direction: column; padding: 20px; }
.episode-card h3 { margin: 0 0 13px; font-size: 1.35rem; letter-spacing: -0.025em; }
.episode-card__summary { margin: 15px 0; color: #45536a; font-size: 0.94rem; }

.badges, .topics { display: flex; flex-wrap: wrap; gap: 7px; }
.badge, .topic { border-radius: 999px; font-size: 0.74rem; font-weight: 700; }
.badge { padding: 5px 9px; color: #15566b; background: #e5f7fa; }
.badge--grade { color: #6b4c00; background: #fff2bc; }
.topic { padding: 5px 9px; color: #6e3840; background: #fff0ef; }

.episode-card details { margin-top: auto; padding-top: 15px; border-top: 1px solid var(--line); }
.episode-card summary { color: var(--blue-dark); font-size: 0.88rem; font-weight: 800; cursor: pointer; }
.episode-card details p { margin: 11px 0 0; color: #526078; font-size: 0.88rem; }
.source-link { display: inline-block; margin-top: 12px; color: var(--blue-dark); font-size: 0.8rem; }

.empty-state { padding: 70px 20px; text-align: center; }
.empty-state span { display: block; color: var(--coral); font-size: 4rem; transform: rotate(-15deg); }
.empty-state h2 { margin-bottom: 8px; }
.empty-state p { color: var(--muted); }

footer { color: #d8e5f5; background: var(--ink); }
.footer__content { min-height: 120px; }
.footer__content p { margin: 0; }
.footer__content a { color: var(--yellow); text-decoration: none; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 900px) {
  .episode-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero::after { right: -260px; }
}

@media (max-width: 620px) {
  .shell { width: min(100% - 24px, 1160px); }
  .hero { min-height: 500px; }
  .hero__content { padding-top: 70px; }
  .filters { padding: 22px 18px; border-radius: 22px; }
  .filters__heading, .catalog__status, .footer__content { align-items: flex-start; flex-direction: column; }
  .filter-grid, .episode-grid { grid-template-columns: 1fr; }
  .catalog__hint { display: none; }
  .footer__content { justify-content: center; padding-block: 30px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}